Information on motor oil, car ac, R410A, R22 and R134A refrigerants

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All car models built before 1995 uses R12 as refrigerant for car AC system. Since then R12 is replaced by R134A because of lower GWP. You cannot use R134A in car AC’s deigned for R12 as R134A operates at a much higher pressure.

You have to retrofit your old car AC system to use r134a using below steps .